Danker, in the entry on ETI, suggests the latter reading, "while still in
his mother's womb", and some translations interpret it this way. In the
entry on EK, though, he suggests that EK KOILIAS MHTROS in Ps 21:11 means
"from birth", using sense 5, "of the time when something begins".

If this can mean "while still in his mother's womb", what sense of EK is
being used here?